CVE-2026-22187: Bio-Formats versions up to and including 8.3.0 perform unsafe Java deserialization of attacker-controlled memo

Q: How do I fix CVE-2026-22187?

bio-formats: upgrade to newer than 8.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-22187 being exploited?

CVE-2026-22187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-22187 affect?

CVE-2026-22187 affects bio-formats. Severity is high (CVSS 7.8). Bio-Formats versions up to and including 8.3.0 perform unsafe Java deserialization of attacker-controlled memoization cache files (.bfmemo) during image processing. The loci.formats.Memoizer class automatically loads and deserializes memo f

Routine

HIGH 7.8UPGRADE

CVE-2026-22187 is a high-severity flaw (CVSS 7.8) affecting bio-formats. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Bio-Formats versions up to and including 8.3.0 perform unsafe Java deserialization of attacker-controlled memoization cache files (.bfmemo) during image processing. The loci.formats.Memoizer class automatically loads and deserializes memo files associated with images without validation, integrity checks, or trust enforcement. An attacker who can supply a crafted .bfmemo file alongside an image can trigger deserialization of untrusted data, which

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-01-07
Last modified	2026-10-08

Publisher (CNA): VulnCheck · Vendor: openmicroscopy

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-07 21:16 UTCPublished CVE record published
2026-10-08 16:17 UTCUpdated Record last modified

openmicroscopy bio-formats UPGRADE

Affected: <= 8.3.0

Fixed in: newer than 8.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bio-formats || rpm -q bio-formats || bio-formats --version

2. UPGRADE to newer than 8.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bio-formats

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bio-formats

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-22187?

bio-formats: upgrade to newer than 8.3.0. Exact commands for each OS are on this page.

Is CVE-2026-22187 being exploited?

CVE-2026-22187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-22187 affect?

CVE-2026-22187 affects bio-formats. Severity is high (CVSS 7.8). Bio-Formats versions up to and including 8.3.0 perform unsafe Java deserialization of attacker-controlled memoization cache files (.bfmemo) during image processing. The loci.formats.Memoizer class automatically loads and deserializes memo f

How urgent is CVE-2026-22187?

Priority 38/100. High severity

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-22186 HIGH 7.1 UPGRADE Bio-Formats versions up to and including 8.3.0 contain an XML External Entity (XXE) vulnerability in the Leica

References

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